<TITLE>atan2</TITLE>
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<h3>ATAN2(3)            Linux Programmer's Manual            ATAN2(3)
</h3>

<h3>NAME
</h3>       atan2 - arc tangent function of two variables

<h3>SYNOPSIS
</h3>       #include &lt;math.h&gt;

       double atan2(double y, double x);

<h3>DESCRIPTION
</h3>       The atan2() function calculates the arc tangent of the two
       variables x and y.  It is similar to calculating  the  arc
       tangent  of y / x, except that the signs of both arguments
       are used to determine the quadrant of the result.

<h3>RETURN VALUE
</h3>       The atan2() function returns the result in radians,  which
       is between -PI and PI (inclusive).

<h3>CONFORMING TO
</h3>       SVID 3, POSIX, BSD 4.3, ISO 9899

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<h3>SEE ALSO
</h3><p>
<a href=acos.htm>acos</a>, 
<a href=asin.htm>asin</a>, 
<a href=atan.htm>atan</a>, 
<a href=cos.htm>cos</a>, 
<a href=sin.htm>sin</a>, 
<a href=tan.htm>tan</a>, 
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                           June 8, 1993                         1


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